Who can most accurately tell when the opposite sex is interested in them: men or women?

The more attractive the woman was to the guy, the more likely he was to overestimate her interest in him, researchers found. And it turns out, the less attractive men (who believed they were better looking than the women rated them) were more likely to think beautiful women were hot for them. But the more attractive guys tended to have a more realistic assessment.

And the women? Perilloux and her coauthors found that women underestimated men’s sexual interest.

Believe it or not, this all probably makes sense from an evolutionary perspective, the scientists say. Attractiveness is linked to fertility, so if guys keep hitting on hot women, they’re bound to score occasionally and father sons who act the same way. Those attractive men don’t have to try as hard.